Monkey-wrench.



J. KRAHULEG.

MONKEY WRENCH. APPLICATION FILED irov. so, 1912v Patented Mar. 18, 1913.

2 SHEETS-SHEET 1.

'WITNESSES J. KRAHULBC.

MONKEY WRENCH,

APPLICATION FILED NOV. 30, 1912.

1,056,693. Patented Max. 15%, 191:1

INVENUj/i uu/m /7/f/7//01 fthe pivoted lever.

4 Urrnn STATES PATENT enrich.

501m KRAHULEC, or 'BRAIDWOOB, ILLINOIS.

MONKEY-WRENCH.

To'all itmay concern Belt knownthat I, JOHN KnAnULEc, a

citizen of the United States, and a resident of 'Braidwood, in the county of Will and State of Illinois, have invented an Improvei'nent in Monkey\Vrenclies, of which the following is asp'ecitication. V

My invention is an improvement in that 'class of monkey-wrenches which are providcd with a slidable jaw and a toothed dog adapted to engage a toothed portion of the in the claims.

,In the accompanying-drawings, Figure l isa side view of my improved wrench, the pivoted lever which operates the movable jawbeing shown in the raised or open posi tion.- Fig. 2 is a partly sectional side v ew showing the said lever in the closed position by which the movable jaw is advanced and locked. "Fig. 3 is a perspective view of the lever, the toothed dog, andjlink which connects them. Fig.4 is-i cross section on the 1ine--4-4 of Fig. 2. Fig. 5 is a side view of a modified form of the wrench. Fig. 6 is a partly sectional side 'view of the lever, the

toothed dog, and the connecting link forming parts of the wrench shown in Fig. 5.

Fig. 7 is-a detail section showing the arrangement of the spring catch or lock for Fig. 8 is a perspective =view of said catch or lock. Fig. 9 is a per pective view of the movable jaw and toothed 'oar shank formed integrally therewith.

' I-w-ill first describe the preferred form of my invent-ion which isillustrated in Figs. 1'

to 4, inclusive.

1 indicates the head and fixed jaw of the wrench, and 2 the shank rigidly connected with said jaw and provided with a handle 2.

3 indicates the movable jaw, which is provi ded with a housing that surrounds, and is adapted to slide on, the shank 2. The latter.

is toothed .on'the front side. A lever 4 is pivoted at 5 in the aforesaid housing of the movable jaw 3 and extends inward along the handle, it being, when in the normal open position shown in Fig. 1, at a considerable angle to the shank and handle of the wrench.

Thelimits of vibration of the said lever, or

Specification of Letters Patent.

Patented 51211218, 1913.

Application 'flled November 30, 1912. Serial No. 734,313.

its movement toward and from the shank and handle, are illustrated in Figs. 1 and 2.

I As shown best in Fig. 3, an elongated rectangular' plate 6, which is toothed on the back side, underlies the pivot end of the lever =1 and is adapted to engage the adjacent toothed edge of the shank 2, in virtue of which function it may be termed a dog, or pawl. It is connected with or attached to the lever l by means of a'link'l' which consists of a shortbar having rounded ends that enter transverse socket-s formed in the lever and dog, respectively. The normal position of the dog is illustrated by dotted lines in Figs. 1 and 3, and its operative position'in Fig. 2, as will be further described. A spiral spring 8 is interposed between the inner end of the dog6 and the oppositeportion of the lever 4, the ends of the sp'ring being set in sockets as will be readily under-' stood. Near its forward end and on'the upper side, thedog ('3 is provided with a transversenotch 9 in which an angular shoulder 10 of the lever normally rests. The spring 8 serves to hold the lever 4 normally raised in the posit-ion shown in Fig. 1.

Inthe operation of the wrench, the link 7 performs another function inthat it serves as a strut or thrustbar, the action' resembling the wellknown toggle lever. The strut is at all. times inclined rearward, the angle being greater when the lever is raised as in Figs. 1 and 3, and less when the lever is depressed as shown in Fig. 2. 'But when the lever 4 is pressed down toward the bandle 2*, it forces the inner tooth on the dog 7-into engagement with the teeth of the shank, causing it to actin. a selective way to seat the teeth; then the shoulder 10 on the lever 4. presses against the inclined face of the shoulder 9 on the dog, forcing it backward, thereby forcing all the teeth.of the dog into engagement withthe teet-h..of the shank, the back side of'the lever *1 engag ing. the shoulder 9 on the dog. lVben in this position, the dog is locked to the shank 2 and a forward movement causes the face of shoulder 10 to slide on the, upper face of shoulder 9 on the dog 6. Following such engagement the action of the strut 7 is such that the lever is forcedoutward which neces sarlly in turn forces the movable jaw 3 outward, so that it takes a firmer hold on the nut or other object to which the wrench maybe applied. In brief, in order to adjust the wrench to a nut or other object, the same is applied as indicated in Fig. .1, and the jaw moved into close proximity to said object;

then, upon closing the lever 4, the dog. 6 looks with the wrench shank and the strut 7 forces-theleve-r and movable jaw outward so that the said jaw clamps tightly upon the nut or other object.

It. will be seen that the described outward movement of the lever 4 and the movable jaw 3 is due to the fact that 'when the lever is closed, the-inner end ofthe strut 7 is carried down with it a short distance, thus bringing the strut nearly into alinement with the pivot 5 of the lever and the inner end of the strut which is fulcrumed on the dog. Upon opening-the freeend of the lever 4, it is obvious the jaw 3 will be retracted so as to readily release the wrench from the nut or other object.

For the purpose of holding the pivoted lever locked in the closed position shown in Fig. 2, I employ a spring catch 11 whose back end is secured in a shallow groove formed in the side of the movable jaw or housing, the free end of the catch projecting inward. and engaging abeveled shoulder 12 formed on the leversee especially Fig. 4. The groove'in lever 4 in which'the spring catch is secured describes anarc which is concentric with the'fulcrum 5 of the lever.

It will now be understood that Whenthe lever is closed against the handle 2", as

shown in Fig. 2, the free end of the catch 11 will ride over the beveled shoulder 12 of the lever and engage the same, thus holding the lever 4 in the closed .or locking position. But little force is necessary to disengage these parts and to open the le ver 4Q The back or rear end of the groove in lever 4 is. formed with a shoulder which the spring'catch 11 may also engage for stopping the lever in a certain part of its forward movement and preventing it from movingfarther until pulled by hand to the farthest position shown in Fig. 1. WVhen the spring catch thus engages the back shoulder, the lever is held in such position that the teeth of the dog remain engaged with the teeth of the 'shank2, In other words,

it automatically holds the movable jaw while it allows inward movement of the same to release the work held between the jaws.'

'hen the lever 4 is moved toward the handle 2 until the lip on the spring catch drops into the groove in the lever, the teeth on dog 6 engage the teeth on shank 2 and prevent the movable jaw from moving into a different adjustment. The front shoulder 12 on leverA isused only when it is desired to use the tool'as a common monkey wrench. In the modified form of wrench shown in Figs. 5 to 9, inclusive, the movable jaw 13 is formed integrally with a straight bar or shank 14see Fi 9and the latter is provided with a groove which receives a rib spring 20 are substantially the same as in the first or preferred form of my invention illustrated in Figs. 1 to 4. It will be Seen that by closing-the lever 17, the dog will be forced into locking engagement with the toothed portion of the shank 14 of the movable jaw, and, the strut l9 pressing backward against the dog, will force it backward and the dog will carry with it'the jaw. 13, thus closing the latter tightly on the nut or other object. The spring catch or lock 2lsee Figs. 5, 7 and 8is employed as in the case first described, the same being similarly adapted to engage the beveled shoulder 22 formed on thelever 17.

My improvement is obviously adapted to serve as an ordinary monkey-wrench or as a pipe wrench, as occasion requires. v 4

What I claim is: I

1. In a wrench of the type indicated, the combination with a fixed jaw having a toothed shank, of a movable jaw, a lever pivoted to the latter, adog interposed between the lever and toothed shank, a combined link and strut having rounded ends which are held in sockets in the lever and dog, and the same being inclined from the rear portion of the dog toward the pivot of the lever, and a spring interposed be tween the rear end of the dog and the lever, as described.

2. The combination with a fixed jaw and rigid handle and a movable jaw which is slidable toward and from .the'fixed aw, of a pivoted lever, a dog arranged under the fulcrum end of the. lever and provided with a beveled shoulder adjacent to its forward end, the'lever having a shoulder adapted to engage and ride upon the shoulder of the dog, and a combined link and strut connecting the rear end of the dog with the lever and inclined rearward from the fulcrum of the latter, as and for thepurpose specified.

3. The combination with the fixed jaw and rigid shank having teeth on its inner side, of a movable jaw adapt-ed to slide .on said shank, a lever pivoted to the movable jaw and provided with a shoulderon its under side adjacent to the fulcrum, a dog.

that the dog engages the toothed shank, and look the movable jaw, :1 spring interposed the movable jaw is simultaneously locked i l'iehveen the lever and (leg for normally sup- 5 and edvanoed, as described. 3 porting the former, and a "spring locking 4. The combination with a fixed jaw and l device secured to the movable jaw and its -oothed shank rigidly connected therewith, l free end adapted to engage the lever when of a n'iovahle jaw which is. slidable on the l depressed or forced inward, whereby the shank, a lever pivoted to the movable jaw i catch is adapfed to hold the lever in the 20 and extended rearwarch a toothed dog urclosed position, as described. ranged between the fulcrum end of the lever v v '0 and the toothed shank. of the wrench, a de- 1 JOHN KRA'HULEC' \ggice which operatively connects the dog and l \Vitnesses:

ihe leverlso that when the latter is depressed \VILLIAM J AGK, thedog 1s engaged with the shank so as in 1 LOUIS FRASCA. 

